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Finding the Fourth Proportional to 139,791.40, 192,914.18 and 76,129.04

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Solution

The fourth proportional to 139,791.40, 192,914.18 and 76,129.04 is: 105,059.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,791.40 : 192,914.18 = 76,129.04 : x
  2. Step 2: Convert to fraction form
    139,791.40/192,914.18 = 76,129.04/x
  3. Step 3: Cross multiply
    139,791.40x = 192,914.18 × 76,129.04
  4. Step 4: Simplify right side
    139,791.40x = 14,686,371,325.79
  5. Step 5: Solve for x
    x = 14,686,371,325.79/139,791.40
  6. Step 6: Final answer
    x = 105,059.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.